James Blunt, the British singer-songwriter behind the romantic anthem of the aughties, “You’re Beautiful,” is the focus of a new documentary.

The project, which is jokingly described as “the story of an ageing, British pop star, still fighting for relevance some 17 years after his star momentarily twinkled,” will follow Blunt all across Europe during his 2022 Greatest Hit Tour.

The doc, which is directed by Chris Atkin, will delve into Blunt’s backstory, from witnessing the genocide of the Kosovo War as a British Army soldier to recording “Back to Bedlam,” the biggest selling album of the 2000s in the U.K. The film will also detail how Blunt endured a harsh backlash following his meteoric success, but “tweeted his way back” by becoming a keen social commentator online.

Blunt, who has 2.2 million followers on Twitter, often responds to trolls online with salty, self-deprecating remarks about his career.

Described as “Spinal Tap” meets “Alan Partridge,...